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首页> 外文期刊>Journal of dentistry >Corrosion resistance of iron-platinum magnets.
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Corrosion resistance of iron-platinum magnets.

机译：铁 - 铂磁铁的耐腐蚀性。

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OBJECTIVES: The objective of this study was to investigate the corrosion resistance of the prototype iron-platinum (FePt) magnets and non-encapsulated neodymium-iron-boron (NdFeB) magnets in three different pH environments. METHODS: The corrosion resistance of the magnets was studied using a corrosion indicator, the breakaway force. The breakaway forces of the magnets after immersion in three media, namely 1% lactic acid solution (pH=2.7), 0.1% sodium sulphide solution (pH=12) and adjusted artificial saliva (pH=6.8) were compared after 28 and 60-day periods. RESULTS: By day 7, all NdFeB magnets dissolved completely in the acid medium, and they showed significantly lower breakaway forces at day 28 and day 60 in artificial saliva (90%, 69%) and in alkaline medium (67%, 42%). In contrast, the FePt magnets did not show a drop in the breakaway forces after immersion in acid or artificial saliva, although approximately half of the original breakaway forces were recorded at day 28 and day 60 after immersion in strong alkali. CONCLUSIONS: The new iron-platinum magnets, which require no yoke assembly or protective casing, has good corrosion resistance for the oral environment. If its retentive force can be improved without increasing its thickness (0.3 mm), then it will have distinct advantages for clinical use.
机译：目的：本研究的目的是研究原型铁 - 铂（扫描）磁体和三种不同pH环境中的非包封的钕 - 铁 - 硼（NdFeB）磁体的耐腐蚀性。方法：使用腐蚀指示器，防止力进行磁体的耐腐蚀性。在浸入三个介质后，磁体的分离力，即1％乳酸溶液（pH = 2.7），0.1％硫化钠溶液（pH = 12）和调节后的人工唾液（pH = 6.8），在28和60--日期。结果：在第7天，所有NDFEB磁体完全溶解在酸介质中，它们在人造唾液（90％，69％）和碱性培养基（67％，42％）的第28天和第60天中显着降低了分支力。相比之下，在浸入酸或人造唾液之后，备用磁体未显示出在分离的力下降，尽管在浸入强碱中的第28天和第60天，在第28天和第60天记录了大约一半的原始分离力。结论：新的铁铂磁铁，需要没有轭组件或保护壳，对口腔环境具有良好的耐腐蚀性。如果可以提高其保持力而不增加其厚度（0.3毫米），那么它将具有明显的临床优点。

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